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victus00 [196]
3 years ago
11

A 100-turn coil with an average radius of 0.04 m is placed in a uniform magnetic field so that ϕ = 60°. The strength of the fiel

d increases at a rate of 0.250 T/s. What is the magnitude of the resulting emf?

Physics
2 answers:
Elodia [21]3 years ago
6 0

Answer:

\epsilon=0.063 V

Explanation:

Accord to Faraday's law, the magnitude of the electromotive force is given by:

\epsilon=\frac{d\Phi_B}{dt}(1)

Magnetic flux is defined as:

\Phi_B=NBAcos(\phi)

Here, N are the coil turns, B is the magnitud of the magnetic field, A is the area and \phi is  the angle between the magnetic field lines and the normal to A.

Then:

\frac{d\Phi_B}{dt}=N\frac{dB}{dt}Acos(\phi)(2)

Replacing (2) in (1) we have:

\epsilon=N\frac{dB}{dt}Acos(\phi)\\\epsilon=100*0.25\frac{T}{s}*pi*(0.04m)^2cos(60^\circ )\\\epsilon=0.063 V

gogolik [260]3 years ago
4 0

<em><u>Five</u></em>

This is exactly like your question 2. You need only substitute the given numbers here.

Givens

  • N = 100 turns
  • delta B = 0.25
  • r = 0.04
  • Area = pi * r^2 = 3.14 * 0.04^2 = 5.02 * 10^-3
  • Cos 60 = 1/2 = 0.5

Formula

e = N * delta B  * Area * cos phi

Solution

e = - 100 * 0.25 *  5.02 * 10^-3 * 0.5

e = 0.0628 = 0.063

Answer

A

<em><u>Six</u></em>

This is a notes question. The result is a sine curve. I don't know how they are counting the change in direction. Is a rising curve different from a falling curve? For sure going from plus to minus is a change in direction, but I still don't know how to count it. It will depend on what you  have been told.

I would answer 4 but this is by no means certain. The only other possible answer is 2

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250,000

Explanation:

<h2> </h2>

<h2>formula = ( F=ma </h2>

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3 years ago
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348.34 m/s. When Superman reaches the train, his final velocity will be 348.34 m/s.

To solve this problem, we are going to use the kinematics equations for constant aceleration. The key for this problem are the equations d=v_{0} t+\frac{at^{2} }{2} and v_{f} =v_{0} +at where d is distance, v_{0} is the initial velocity, v_{f} is the final velocity, t is time, and a is aceleration.

Superman's initial velocity is v_{0}=54.5\frac{m}{s}, and he will have to cover a distance d = 850m in a time t = 4.22s. Since we know d, v_{0} and t, we have to find the aceleration a in order to find v_{f}.

From the equation d=v_{0} t+\frac{at^{2} }{2} we have to clear a, getting the equation as follows: a=\frac{2(d-v_{0}t) }{t^{2} }.

Substituting the values:

a=\frac{2(850m-54.5\frac{m}{s}.4.22s) }{(4.22s)^{2}}=69.63\frac{m}{s^{2}}

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olchik [2.2K]

Answer:

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There are countless household appliances in every single house. One appliance with a low power rating would be a ceiling fan. On average ceiling fans consume roughly 60w and are found in the majority of houses. On the other side of the spectrum, we have a high power-rating appliance such as a microwave. Microwaves use anywhere between 1000w to 1800w of power in order to function correctly. This is very large power consumption and one of the highest power ratings found for appliances in a household.

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2 years ago
In which one of the following situations is zero net work done? A) A ball rolls down an inclined plane. B) A physics student str
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Answer:

Option D

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The work done can be given by the mechanical energy used to do work, i.e., Kinetic energy and potential energy provided to do the work.

In all the cases, except option D, the energy provided to do the useful work is not zero and hence work done is not zero.  

In option D, the box is being pulled with constant velocity, making the acceleration zero and thus Kinetic energy of the system is zero. Hence work done in this case is zero.

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